horizontal, zébré, zazou, azimuté
I'm not sure but I would say : none
There are no adjectives beginning with the letter z that describe a shy person.
analyzablecognizableenzymaticfreezablehazardoushorizontalmagnetizablenonhazardousorganizationaloverzealousprotozoicquizzicalrealizablerecognizableschizophrenicsizablesizeablesqueezabletrapezoidalunrecognizablezealouszestfulzodiacalzonalzoologicalzoophyticzygotic
zany !
there are too many adjectives in French to give it a try. That wouldn't be much use anyway: with just a few hundred words (not only adjectives), you will be perfectly undertood by French speakers.
zealous
zaftigzanyzappedzappyzealouszerozestfulzestyzingyzippyzonked
icyjumpykindlumpymaniacalnewoptimisticpopularquietrambunctioussoftturbulentuglyvaguewetxenophobicyouthfulzesty
There are a great many French adjectives that begin with the letter B. Belle is one French adjective that means beautiful.
ambitiousbrilliantcourteousdecisiveenergeticfearlessgeneroushumbleindustriousjovialkindheartedlikeablemodestneighborlyoptimisticpragmaticquietreliablesincerethoughtfulunselfishvigilantwittyxenophobicyouthfulzealous
les adjectifs
In French, adjectives must agree in gender and number with the noun they describe. Adjectives typically come after the noun they modify, unlike in English where they come before. Adjectives can also be placed before the noun for emphasis or to convey a certain nuance.